National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Mostly Cloudy

79°F

26°C

Humidity 88%
Wind Speed S 8 mph
Barometer 30.01 in (1015.1 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 31 Jul 12:56 am CDT
Extended Forecast for

Lockhart TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 75. South wind 5 to 10 mph.

    Low: 75 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny and hot, with a high near 100. Heat index values as high as 106. South southwest wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 99. Heat index values as high as 105. Southwest wind around 5 mph.

    High: 99 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 77. North northeast wind around 5 mph becoming calm. Chance of precipitation is 30%.

    Low: 77 °F

    Chance
    Showers

  • Sunday

    Sunday: Sunny and hot, with a high near 100. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77. North northeast wind around 5 mph becoming calm in the evening.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 101. Calm wind becoming southwest around 5 mph.

    High: 101 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 75. South wind 5 to 10 mph.
Friday
Mostly cloudy, then gradually becoming sunny and hot, with a high near 100. Heat index values as high as 106. South southwest wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 99. Heat index values as high as 105. Southwest wind around 5 mph.
Saturday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 77. North northeast wind around 5 mph becoming calm. Chance of precipitation is 30%.
Sunday
Sunny and hot, with a high near 100. Calm wind becoming north northeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 77. North northeast wind around 5 mph becoming calm in the evening.
Monday
Sunny and hot, with a high near 101. Calm wind becoming southwest around 5 mph.
Monday Night
Mostly clear, with a low around 77. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 100.
Tuesday Night
Mostly clear, with a low around 77.
Wednesday
Mostly sunny and hot, with a high near 99.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Mostly sunny, with a high near 98.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
1:30 am CDT Jul 31, 2026
Forecast Valid:
1am CDT Jul 31, 2026-6pm CDT Aug 6, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation